4 to the power of3 -(2+2to the power of 3) x 5​

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

David estimated he had about 20 fish in his pond. a year later, there were about 1.5 times as many fish. the year after that, the number of fish increased by a factor of 1.5 again. the number of fish is modeled by f(x)=20(1.5)^x. create a question you could ask that could be answered only by graphing or using a logarithm.

An 18% discount on a watch saved a shopper $72. find the price of the watch before the discount